Let f(x)=-1-x-2x2, evaluate (f(x+h)-f(x))/h.Factor out the negative sign for the final answer, if any.
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Subtract -1-x-2x^2: f(x+h)-f(x)=-h-4hx-2h^2;

Divide by h: -1-4x-2h=-(1+4x+2h).
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